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Abstract

A two-dimensional spectral-shearing interferogram has been acquired instantaneously by frequency- and time-resolved sum-frequency conversion where the phase-matching angle and transverse-delay of crossed-pump beams in a nonlinear crystal serve as frequency-time decomposed imaging. The two spectrally sheared components travel the same path after upconversion. A picoseconds delay-scanned interferogram is accumulated on a 2D image sensor.

(a) Instantaneously acquired delay sweeping of the spectral-shearing interferogram. One fringe corresponds to 122 fs. (b) Evaluation of filtering width and linearity of the delay sweeping. Power spectral density and phase of 1D FFT at a center frequency of 377 THz described as dots and triangles, respectively. The thin curve is the power density of the beat estimated from the two modes of the etalon. (c) Retrieved spectral phase with beat-frequency filtering. (d) Reconstructed waveform.

Relative accuracy verification using synthesized-quartz plates. (a) Spectral phase as a function of the glass thickness. Dotted line shows calculation from the Sellmeier equation. (b) Group delay. (c) Diamonds show second-order spectral phase as a function of the glass thickness. Thick line is calculation.